How to validate that at least one checkbox should be selected?

Question

I want to do validation for checkboxes here without form tag. At least one checkbox should be selected.

Answer 1

Add (ngModelChange)="onChange(officeLIST)" to your checkbox and have below code in your .ts file.

onChange(items) {
    var found = items.find(function (x) { return x.checked === true; });
    if (found)
      this.isChecked = true;
    else
      this.isChecked = false;
  }

Use isChecked variable any places you want.